As discussed previously, one file can be associated with another by means of the Refers to relation. For example, our data model contains the RACE ENTRY Refers to HORSE, and RACE ENTRY Refers to JOCKEY relations. Note that since the referenced file in these two relations are different, there is no difficulty in distinguishing between them.
A file can also reference another file more than once. In order to distinguish among multiple references to the same file,CA 2E provides an extended form of the Refers to relation that lets you specify differences among the relations using For text.
In addition, a file can refer to itself. This is known as involution or a self-referencing relation.
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